348 lines
13 KiB
C
348 lines
13 KiB
C
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// Copyright (c) 2006-2008 Fernando Luis Cacciola Carballal. All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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// You can redistribute it and/or modify it under the terms of the GNU
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// General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: GPL-3.0+
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//
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// Author(s) : Fernando Cacciola <fernando_cacciola@ciudad.com.ar>
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//
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#ifndef CGAL_CREATE_OFFSET_POLYGONS_2_H
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#define CGAL_CREATE_OFFSET_POLYGONS_2_H
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#include <CGAL/license/Straight_skeleton_2.h>
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#include <CGAL/disable_warnings.h>
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#include <CGAL/create_straight_skeleton_2.h>
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#include <CGAL/Polygon_offset_builder_2.h>
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#include <CGAL/Straight_skeleton_converter_2.h>
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#include <CGAL/compute_outer_frame_margin.h>
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#include <CGAL/Polygon_2.h>
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namespace CGAL {
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namespace CGAL_SS_i
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{
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template<class U, class V> struct Is_same_type { typedef Tag_false type ; } ;
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template<class U> struct Is_same_type<U,U> { typedef Tag_true type ; } ;
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template<class FT, class PointIterator, class HoleIterator, class K>
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boost::shared_ptr< Straight_skeleton_2<K> >
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create_partial_interior_straight_skeleton_2 ( FT const& aMaxTime
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, PointIterator aOuterContour_VerticesBegin
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, PointIterator aOuterContour_VerticesEnd
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, HoleIterator aHolesBegin
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, HoleIterator aHolesEnd
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, K const&
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)
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{
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typedef Straight_skeleton_2<K> Ss ;
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typedef Straight_skeleton_builder_traits_2<K> SsBuilderTraits;
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typedef Straight_skeleton_builder_2<SsBuilderTraits,Ss> SsBuilder;
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typedef typename K::FT KFT ;
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typedef typename std::iterator_traits<PointIterator>::value_type InputPoint ;
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typedef typename Kernel_traits<InputPoint>::Kernel InputKernel ;
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Cartesian_converter<InputKernel, K> Converter ;
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boost::optional<KFT> lMaxTime( Converter(aMaxTime) ) ;
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SsBuilder ssb( lMaxTime ) ;
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ssb.enter_contour( aOuterContour_VerticesBegin, aOuterContour_VerticesEnd, Converter ) ;
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for ( HoleIterator hi = aHolesBegin ; hi != aHolesEnd ; ++ hi )
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ssb.enter_contour( CGAL_SS_i::vertices_begin(*hi), CGAL_SS_i::vertices_end(*hi), Converter ) ;
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return ssb.construct_skeleton();
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}
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template<class FT, class PointIterator, class K>
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boost::shared_ptr< Straight_skeleton_2<K> >
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create_partial_exterior_straight_skeleton_2 ( FT const& aMaxOffset
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, PointIterator aVerticesBegin
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, PointIterator aVerticesEnd
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, K const& k
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)
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{
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typedef typename std::iterator_traits<PointIterator>::value_type Point_2 ;
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typedef Straight_skeleton_2<K> Ss ;
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typedef boost::shared_ptr<Ss> SsPtr ;
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SsPtr rSkeleton ;
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boost::optional<FT> margin = compute_outer_frame_margin( aVerticesBegin
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, aVerticesEnd
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, aMaxOffset
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);
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if ( margin )
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{
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Bbox_2 bbox = bbox_2(aVerticesBegin, aVerticesEnd);
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FT fxmin = bbox.xmin() - *margin ;
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FT fxmax = bbox.xmax() + *margin ;
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FT fymin = bbox.ymin() - *margin ;
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FT fymax = bbox.ymax() + *margin ;
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Point_2 frame[4] ;
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frame[0] = Point_2(fxmin,fymin) ;
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frame[1] = Point_2(fxmax,fymin) ;
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frame[2] = Point_2(fxmax,fymax) ;
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frame[3] = Point_2(fxmin,fymax) ;
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typedef std::vector<Point_2> Hole ;
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Hole lPoly(aVerticesBegin, aVerticesEnd);
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std::reverse(lPoly.begin(), lPoly.end());
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std::vector<Hole> holes ;
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holes.push_back(lPoly) ;
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rSkeleton = create_partial_interior_straight_skeleton_2(aMaxOffset,frame, frame+4, holes.begin(), holes.end(), k ) ;
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}
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return rSkeleton ;
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}
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//
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// Kernel != Skeleton::kernel. The skeleton is converted to Straight_skeleton_2<Kernel>
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//
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template<class OutPolygon, class FT, class Skeleton, class K>
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std::vector< boost::shared_ptr<OutPolygon> >
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create_offset_polygons_2 ( FT const& aOffset, Skeleton const& aSs, K const& , Tag_false )
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{
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typedef boost::shared_ptr<OutPolygon> OutPolygonPtr ;
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typedef std::vector<OutPolygonPtr> OutPolygonPtrVector ;
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typedef Straight_skeleton_2<K> OfSkeleton ;
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typedef Polygon_offset_builder_traits_2<K> OffsetBuilderTraits;
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typedef Polygon_offset_builder_2<OfSkeleton,OffsetBuilderTraits,OutPolygon> OffsetBuilder;
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OutPolygonPtrVector rR ;
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boost::shared_ptr<OfSkeleton> lConvertedSs = convert_straight_skeleton_2<OfSkeleton>(aSs);
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OffsetBuilder ob( *lConvertedSs );
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ob.construct_offset_contours(aOffset, std::back_inserter(rR) ) ;
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return rR ;
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}
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//
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// Kernel == Skeleton::kernel, no convertion
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//
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template<class OutPolygon, class FT, class Skeleton, class K>
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std::vector< boost::shared_ptr<OutPolygon> >
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create_offset_polygons_2 ( FT const& aOffset, Skeleton const& aSs, K const& /*k*/, Tag_true )
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{
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typedef boost::shared_ptr<OutPolygon> OutPolygonPtr ;
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typedef std::vector<OutPolygonPtr> OutPolygonPtrVector ;
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typedef Polygon_offset_builder_traits_2<K> OffsetBuilderTraits;
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typedef Polygon_offset_builder_2<Skeleton,OffsetBuilderTraits,OutPolygon> OffsetBuilder;
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OutPolygonPtrVector rR ;
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OffsetBuilder ob(aSs);
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ob.construct_offset_contours(aOffset, std::back_inserter(rR) ) ;
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return rR ;
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}
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// Allow failure due to invalid straight skeletons to go through the users
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template<class Skeleton>
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Skeleton const& dereference ( boost::shared_ptr<Skeleton> const& ss )
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{
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CGAL_precondition(ss.get() != 0);
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return *ss;
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}
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}
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template<class Polygon, class FT, class Skeleton, class K>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_offset_polygons_2 ( FT const& aOffset, Skeleton const& aSs, K const& k )
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{
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typedef typename Skeleton::Traits SsKernel ;
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typename CGAL_SS_i::Is_same_type<K,SsKernel>::type same_kernel ;
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return CGAL_SS_i::create_offset_polygons_2<Polygon>(aOffset,aSs,k,same_kernel);
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}
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template<class FT, class Skeleton, class K>
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std::vector< boost::shared_ptr< Polygon_2<K> > >
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inline
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create_offset_polygons_2 ( FT const& aOffset, Skeleton const& aSs, K const& k )
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{
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typedef Polygon_2<K> Polygon ;
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return create_offset_polygons_2<Polygon>(aOffset, aSs, k ) ;
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}
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template<class Polygon, class FT, class Skeleton>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_offset_polygons_2 ( FT const& aOffset, Skeleton const& aSs )
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{
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return create_offset_polygons_2<Polygon>(aOffset, aSs, typename Polygon::Traits() ) ;
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}
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template<class FT, class Polygon, class HoleIterator, class OfK, class SsK>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_interior_skeleton_and_offset_polygons_2 ( FT const& aOffset
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, Polygon const& aOuterBoundary
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, HoleIterator aHolesBegin
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, HoleIterator aHolesEnd
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, OfK const& ofk
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, SsK const& ssk
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)
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{
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return create_offset_polygons_2<Polygon>
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(aOffset
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,CGAL_SS_i::dereference
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( CGAL_SS_i::create_partial_interior_straight_skeleton_2(aOffset
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,CGAL_SS_i::vertices_begin(aOuterBoundary)
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,CGAL_SS_i::vertices_end (aOuterBoundary)
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,aHolesBegin
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,aHolesEnd
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,ssk
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)
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)
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,ofk
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);
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}
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template<class FT, class Polygon, class HoleIterator, class OfK>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_interior_skeleton_and_offset_polygons_2 ( FT const& aOffset
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, Polygon const& aOuterBoundary
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, HoleIterator aHolesBegin
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, HoleIterator aHolesEnd
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, OfK const& ofk
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)
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{
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return create_interior_skeleton_and_offset_polygons_2(aOffset
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,aOuterBoundary
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,aHolesBegin
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,aHolesEnd
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,ofk
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,Exact_predicates_inexact_constructions_kernel()
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);
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}
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template<class FT, class Polygon, class OfK, class SsK>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_interior_skeleton_and_offset_polygons_2 ( FT const& aOffset, Polygon const& aPoly, OfK const& ofk, SsK const& ssk )
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{
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std::vector<Polygon> no_holes ;
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return create_interior_skeleton_and_offset_polygons_2(aOffset
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,aPoly
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,no_holes.begin()
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,no_holes.end()
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,ofk
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,ssk
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);
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}
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template<class FT, class Polygon, class OfK>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_interior_skeleton_and_offset_polygons_2 ( FT const& aOffset, Polygon const& aPoly, OfK const& ofk )
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{
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std::vector<Polygon> no_holes ;
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return create_interior_skeleton_and_offset_polygons_2(aOffset
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,aPoly
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,no_holes.begin()
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,no_holes.end()
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,ofk
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,Exact_predicates_inexact_constructions_kernel()
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);
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}
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template<class FT, class Polygon>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_interior_skeleton_and_offset_polygons_2 ( FT const& aOffset, Polygon const& aPoly )
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{
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return create_interior_skeleton_and_offset_polygons_2(aOffset, aPoly, typename Polygon::Traits() );
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}
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template<class FT, class Polygon, class OfK, class SsK>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_exterior_skeleton_and_offset_polygons_2 ( FT const& aOffset, Polygon const& aPoly, OfK const& ofk , SsK const& ssk)
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{
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return create_offset_polygons_2<Polygon>
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(aOffset
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,CGAL_SS_i::dereference
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(CGAL_SS_i::create_partial_exterior_straight_skeleton_2(aOffset
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,CGAL_SS_i::vertices_begin(aPoly)
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,CGAL_SS_i::vertices_end (aPoly)
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,ssk
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)
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)
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,ofk
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);
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}
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template<class FT, class Polygon, class OfK>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_exterior_skeleton_and_offset_polygons_2 ( FT const& aOffset, Polygon const& aPoly, OfK const& ofk )
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{
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return create_exterior_skeleton_and_offset_polygons_2(aOffset
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,aPoly
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,ofk
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,Exact_predicates_inexact_constructions_kernel()
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);
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}
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template<class FT, class Polygon>
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std::vector< boost::shared_ptr<Polygon> >
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inline
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create_exterior_skeleton_and_offset_polygons_2 ( FT const& aOffset, Polygon const& aOuterBoundary )
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{
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return create_exterior_skeleton_and_offset_polygons_2(aOffset, aOuterBoundary, typename Polygon::Traits() );
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}
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} // end namespace CGAL
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#include <CGAL/enable_warnings.h>
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#endif
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// EOF //
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